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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b41d24d70b079bd8d940581c3f5a73dd1b1598f8d0d5de9ed011129592ad693' 
  AND token = 'tBUNxSggaGOldbRqmoIkIa3a8kvRhvztsu0F7Rz3Hlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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