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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504c9596663849f3ef425b3986a1e194581a6889ccd52e8b82a4f673dca1ae7d' 
  AND token = '3WpVdTAHjHqYavZ1Oj2i7JdbEVHZ2YJskGAH1li5KR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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