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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd047b2dde136bce96b790ccfe6b8cefbf74187bb7ade4eaded5bafebdd3361d0' 
  AND token = 'lJSFtMhAhaB4+8s48wAgLUycyTfcG545U2FrIpx3tlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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