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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d3ad97f83c2bb6d432f8bb5432cf709b1b1fbb3f66b69afb19e04c73976a0b' 
  AND token = 'o+mngdEXTiDByCvB+0LK/KhRFIESfL7+In0zefqwrt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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