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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b754b81f608d3079baea5c2bc940ddcd7a3c601c2b4d9504f9ad54d5421982' 
  AND token = 'FaAZj2jkx0JbOUoeChe7YG+Fq1Z0lz2cnVkN2Bw3HS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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