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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1733ea3a1371d6950d71d56da42169f22af3758ae124d397b17f074055b3477' 
  AND token = 'vVMPTKhKY7SRbzD8747tWrRW1o/AnhqpfaEssjrXjzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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