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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23e6a96d7c034bb3277e07e5525d5881780114e978a171d63ee44456ddfb6e8' 
  AND token = '/UP89vU2s5j7A7Cw2DUgNBNxwuBhqiDW8SG/dhkwX/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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