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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e45c9cef3cd961485f6425621f7157810972657366bec0e97c08ee013087033' 
  AND token = 'ikrRZ0vL6HP+JM6YZ4MPDXVnvvu6rpwrpSK2AV8OKAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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