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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b87f84a5bd0928b7bd08ac9d20c8789f3004deef50419ee946394b7c3e484f2' 
  AND token = 'S29KxJUTEl+f8fTY/M5Q1Gms5pp7347nepah9t/9cbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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