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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3341239a35dd40f097634c72cc23be752c6e0a3b25e67377638feba124dc72' 
  AND token = 'frfaszS2mvTc7hX2b4gPt+HLdBQ0Pdio6ZGwHd7Jg1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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