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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac5796ca77faf2b9c187d2e66ed484798d4b1fed55026b884609c4ed0f1cade' 
  AND token = 'TFprj0yKuyGGg4YmF+LkVaXm2oJECjWDX5TsOsceVPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}