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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6b83baf6913bbdcaa0ba1d0445fad8c73322a64bc2f77adc2237e4ecd273fb' 
  AND token = 'Oyh2UgqwM45je5dferU7lWc+yLiRLW2ullDeC0vbx/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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