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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e237df735ad8639490c74ae23ff6f404c0167dc8f4fb03f6ec49d1982702730' 
  AND token = 'Wi6G+Rj8tfOV6h/12ht9da2hg07niZarfjIKDMgLU2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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