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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee6c1327f3a5d6f1079def15db3f8a97ea5e2a455ded50ea42faf24d18550ae' 
  AND token = 'Fx5HhFPntD9n+mD6Tye4egCIva+ifksihNZXvTNi/y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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