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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facc0bcb974c26a63d48d5405854c6e5440b4f49b49ad8bf06cc17f1c8bc8987' 
  AND token = '5O6jXt2cq7xu7tYVO4/lUsD8J6jl5fPx2+meJ2NrUhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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