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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd07e0ca6ec0649dd388429d2693981cb4d86ad9de652d7853459060f3ff5e5' 
  AND token = 'UUbpr11yWal2fwYIuVghgc/3GNoF4uCKb9CPZ72zo90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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