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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3f5c72d1bf89972ca820997e52296b8fcb44c20b1b3c75b0b36022114952a5' 
  AND token = 'J1OGSX5ytpsFGndmT7kCT9F52Q4j/g3wRyk/EVjBhoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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