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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26abb714e2dc7e4f4554412c5e7a093defca6c95b0d7722f020cc02d0a2cb490' 
  AND token = 'SBD4KJJ+3VBqAh+gLefo1YrMo3t8H1xo0E7eWGNPUvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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