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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fef142d469eb25fff37d9ad5a63de3d369cae7344f82ac11a22752502fa450' 
  AND token = 'H53mE59VEwRQ5YPQbMpc4ZzkBv0krnPDFn+LGJn0WR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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