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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0069607f116f9de1d1ff5becc9eba199cedc0717a2d4c59abc28df055a360b10' 
  AND token = '85+5jItM8gUlgAZyqwuLX3N1yRy2tBCbg8veACxkLb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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