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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5558b4e04fe63d48e4d492e5901edc0b18d51e22da40ab77b597e244ef1dfbd7' 
  AND token = 'zoIgDAIdMjXqyfzzbzZA3LJiPHFjtthTZchEO7Fi19A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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