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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e48e3f4954e4cbf6219c4c8420f9d6aad2337992beafd7b6782c8296e88abd4' 
  AND token = 'V2m+O1+CQHHMA3xJrEHcbpKIyeG8UYze3oGSkrw1cb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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