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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe03d5844595e1ba45ffcc4d1032f6a4de2cecdc746e7374f497f212e912a95' 
  AND token = 'eaAy9tZ9eyPTLk/6VRuOS69QZznsUWoIRchBG9tL4rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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