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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ef670b5ac2789d5c8af8779f2503dcc86ba95d5c9367075edddecb0aaeca0a' 
  AND token = '2sqZnLJEAn4KZXNbah08STk0B8+8FvCIWwrO6wR3ZqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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