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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea75929435a9c4fed8e9f804b36249bc26d49b02c374de363130e444ee139c1' 
  AND token = 'XdGc3I64I/OpBlp8znKNKgWwcQIdwVnwYhRRzEabdrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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