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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abe72e7f8c4847e2d54b2a138734ccba309ccd667a51e2e8e3f01ecc8e8ed69' 
  AND token = 'w7LT8KxF4jNCEGahGRJ2p9kM4vRkjljMkP7SyL3OoyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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