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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8cf0bb38b16b324fb3a7f18cbfe51b61a5ccefe40758859b4a5ec597b2da6c' 
  AND token = 'XqsVX0K31PbU0s+JOKO1ttZmUWd+UkaF9fQF4oaBSFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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