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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c722afc193ee29eb966ed76d3f3b21e79a08248bb0d4575eaf4fed1078b2e196' 
  AND token = 'LBPXn4kh6POg4diAtGlyLHD1YhkeS3/Qjzn2auR6fkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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