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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dad84083db11bc9a568693886ab3a04223c45a1a734afad04ddb0146567308' 
  AND token = 'DH5iuWsXdDZfXRD82I+HJ72CO8SfwBRoCEj1m5u95mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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