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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc36c2af29cbcbf5c4e08d83e30dcac1bb23289d1e659aa12ce678bc2d70a0a' 
  AND token = 'b69RNZmWNzw22cM1BPMHchVfZicsXNlrsUlw3AIq4oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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