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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a917c4809ceab2b1095bc9d6d2ffd0aff8af5b5d2f9a252b15486d31d4874c6a' 
  AND token = 'ChHW+NfjNhMPHV0btF/SAU3Rs95+1YGSt3+U79Ge7ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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