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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fc79c8939ce39a8a3730cabe3396b3968914d9d57dd12e96ef3f45fb7470b8' 
  AND token = 'd2I0TsbPpSAlX1J0rijnawJYYN464Vt1kIV0FdBmBhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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